Topics started by evavanesseveldt
Hi, For my graduation product, I am modelling a production planning system in the context of a rolling horizon. The model can allocated products to plant A and plant B, based on the expected demand for the upcoming periods. Plant A has a production lead-time of 1 week and plant B has a production lead-time of 2 weeks. Note that for some products, it is cheaper to produce at plant A, whereas for other products, it is cheaper to produce at plant B. I formulated the following constraint in AIMMS to update the inventory: Inventory(p,h)=Inventory(p,h-1)-sum(r,ProductionRelease(p,r,h-LeadTime(r)))+LostSales(p,h) In which p refers to the set of products, h to the horizon, and r to the set of plants. The LeadTime(r) is modeled as a parameter and takes value 1 for plant A and value 2 for plant B. However, with this constraint, AIMMS always allocates all products to plant A. When modelling the inventory constraint by: Inventory(p,h)=Inventory(p,h-1)-sum(r,ProductionRelease(p,r,h-1))+Lost
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